期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 1, 页码 173-178出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL057984
关键词
convective triggering; buoyant mixing; moist convection diagnostic; boundary layer growth; atmospheric background; land-atmosphere interaction
资金
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0947837] Funding Source: National Science Foundation
Here we introduce the heated condensation framework, which contains a suite of variables for isolating the atmospheric boundary state from local surface forcing. The buoyant condensation level (BCL) and buoyant mixing temperature ((BM)) quantify the degree to which the atmosphere is preconditioned for moist convection and can be calculated for any time of day or year using standard vertical profiles of temperature and humidity. Unlike the lifted condensation level and convective inhibition, the BCL is constructed through incremental mixing from the surface rather than lifting a hypothetical parcel. In this regard, the BCL represents a conserved condensation level diagnostic inherent to a given profile. The BCL and (BM) are shown to be applicable over a range of climate regimes and respond to synoptic and mesoscale forcings, illustrating its broader utility. A suite of variables relating the BCL directly to surface fluxes is also introduced.
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